Drill-sharpener



PATENTED FEB. 16, 1904.

J. L. BRYSON. DRILL SHARPENER.

APPLICATION FILED FEB. 14, 1903.

2 SHEETS-SHEET 1.

N0 MODEL.

JWZAZ Q PATENTED FEB. 16, 1904.

J. L. BRYSON.

2 SHEETS-SHEET 2.

DRILL SHARPEN ER. APPLIUATIONTILED FEB 14, 1903.

no MODEL.

wal y/4%!- Patented February '16, 1904.

UNITED- STATES PATENT Ormcn.

JAMES L. BRYSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALF TODEW R. OLIVER, OF SAN FRANCISCO, CALIFORNIA.

DRlLL-SHARPENER.

SPECIFICATION formingpart of Letters Patent No. 752,026, dated February16, 1904.

Application filed February 14:, 1903. Serial No. 143,428. (No model.)

To all whom it may concern: I

Be it kn own that I, JAMES L. BRYSON, a citi.

either to the construction of new drills from blank rods or to thesharpening of old bits after use.

I have shown certain embodiments of my invention in the accompanyingdrawings, in which Figure 1 is a side elevation of the complete machine.Fig. 2 is a plan view. Fig. 3 is a detail perspective view of soliddolly form ing the mold for receiving and shaping the end of the bit.Fig. 1 is a front elevation. Fig. 5 is a view of the completed drill orbit. Fig. 6 is a front elevation of the dolly. Fig. 7 is a sideelevation of the dolly with its support in section. Fig. 8 is a top viewof a modi- 2 5 fied construction of dolly. Fig. 9 is a front view ofsame. Fig. 10 is a front view of the dolly shown in Fig. 7 with armsopen. Fig. 11 is a similar view with arms closed.

Figs. 1, 2, and 4 give different views of a complete apparatus designedeither for making new bits or for resharpening old ones. These bits areformed in the ends of hardenedsteel rods, which as they become worn areresharpened, becoming gradually shortened in the operation. The shape ofthe bit is shown in Fig. 5, consisting of an enlarged head upset upon arod 1 and then recessed longitudinally, so as to leave two intersectingblades at right angles, which are sharpened to cutting edges. Theseedges wear very rapidly against hard rock and must be repeatedly upsetand resharpened in order to be effective.

Vertical and horizontal steam-hammers 2 and 3 are provided for givingthe successions of blows required for shaping and sharpening. Theconstruction and operation of these hammers form no parts of myinvention; but I have shown enough of them to give an intelligent ideaof the whole system of operation. From a pair of 'treadles 4. and 5,mounted upon 5 shafts 6 7, Fig. 2, rods extend to the controlling-valvesof the two hammers in a well-- known way, so that such hammers can beindividually and separately brought into action to perform theirallotted functions upon the drill-bit or drill-blank, as the case maybe. Thus from the treadle 1, Fig. 1, a system of rods goes to thecontrolling-valves of the vertical steam-cylinder 8, and from thetreadle 5 a system of rods goes to the horizontal steam- 0 cylinder 9.When either treadle is moved, the connected hammer is put into rapidvibration, so as to act upon the metal exposed'to it. Referringspecially to Fig. 1, the vertical hammer and anvil are appropriately andoppositely 6 5 grooved and shaped, as shown at 11, so as to split orrecess back a rod laid between them.

In the bed of the whole machine is dovetailed a sliding support 12,Figs. 6 and 7. This supports the dolly, which first upsets the 7 end ofthe drill and finishes and sharpens the bits after the vertical hammerhas formed the recesses therein. An anvil is secured to said support bythe bolts 13 and is provided with the converging arms 14;, each of whichis substantially a quadrant in cross-section and all of which areseparated from one another, so as to receive the drill-blank or drill tobe resharpened. The free ends of the arms of the dolly may bebeveled, asshown at 15, and the faces of such ends are V-grooved diagonally, as at16",

so that such grooves receive the bit. On the converging arms of thedolly works a sleeve 16, Fig. 7., having a nut 17, through which passesthe screw 18, the latter having an op- 5 crating-handle 19. The saidhandle can be operated to force the sleeve upon the arms of the dolly toclose them. By releasing the sleeve the spring-arms of the dolly openautomatically. A part of the support 12 is a rest 9 21, upon which thebit is moved forwardly and into position with the arms of the doll-y.Now when the bit is held in place in the rest and the proper treadle ismoved the bit receives a series of blows from the horizontal hammerwhile it is in contact with the beveled faces of the arms of the dolly,and thereby receives new edges, or, in other words, becomes resharpened.

In the base of the machine are a screw 22 and guide-rod 23, whichsupport a carrier 24, which holds the drill. The screw 22 can beoperated by any suitable power, and I have shown a shaft 25, havingfriction-gears 26 feathered upon it, which by means of a driving-shaft27 and friction-disk 28 can be caused to move in either direction, andthus bring longer or shorter drills up to position. The carrier 24 hasthe projecting rest to support the drill when presented to the verticalhammer.

The dolly shown in Figs. 3 and 7 sharpens all four arms of the bitsimultaneously, and it is not necessary to change the bit by aquarterturn for a second operation.

In Figs. 8 and 9 I have shown a modified form of dolly, in whichhand-levers 30 31 are used to bring together dies 32, which form theface against which the bit rests. This clamp, with the hand-levers foroperating it, performs, substantially, the function of the sleeve,screw, and single hand-lever shown in Fig. 7.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a machine for the described purpose, adolly comprising an anvil,separated arms extending therefrom and having grooved ends,

a support for drill-bits in line with the free ends of said arms, meansfor adjusting said support relatively to said arms, means for closingand releasing the free ends of said arms, and a hammer.

2. In a machine for the described purpose, an anvil, spring-arms forminga part thereof and adapted to be closed together and to open, grooves inthe ends of said arms to receive the bit, and means for clamping saidarms together and for releasing said arms.

3. A dolly for drill-Sharpeners having separated spring-arms withgrooved free ends, and means for closing said arms.

4;. In a machine for the described purpose, a cone-shaped dolly havingseparated springarms with grooved free ends, in combination with anadjustable cone-shaped sleeve inclosing said arms and adapted to clampsaid arms together and to release said arms.

5. In a machine for making and sharpening drill bits, a hammer, amovable dolly adapted to receive the impact of said hammer, separatedarms forming a part of said dolly and shaped at their open ends toreceive the bit,

.a sleeve adapted to fit said arms, and a screw provided with means foradjusting said sleeve so as to clamp said arms and release said arms. Intestimony whereof I have affixed my signature, in presenceof twowitnesses, this 2d day of February, 1903.

JAMES L. BRYSON. Witnesses:

L. W. SEELY, F. M. BURT.

